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Add example of getInitialProps to with-reasonml (#5975)

The current reasonml needs an example of how to do getInitialProps.  tmepple posted the only known way of doing it in [this comment](https://github.com/zeit/next.js/issues/4202#issuecomment-439175214).   It is unlikely reasonml users are going to discover that comment or figure it out on their own so having it in an example is critical. 

Also, dependencies updated.  After updating dependencies, I get this error:
```
ModuleBuildError: Module build failed (from ./node_modules/next/dist/build/webpack/loaders/next-babel-loader.js):
[1] Error: Cannot find module '@babel/core'
[1]  babel-loader@8 requires Babel 7.x (the package '@babel/core'). If you'd like to use Babel 6.x ('babel-core'), you should install 'babel-loader@7'.
```
Seems like @babel/core is required as peer dependency per [this comment](https://github.com/babel/gulp-babel/issues/124#issuecomment-326853222) so I added it.

The way to do getInitialProps has changed in 7.0.2 canary so this also has a comment in the code about what change is required to get that working.

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